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domain time not syncing

i have a single domain with 3 sites. everything is working fine except that at site 2 the time on the local domain controller will not sync with the PDC at site 1.

each site has it's own domain controller. site 1 is connected to site 2 via private line. site 1 is connected to site 3 via VPN at our firewalls. site 2 and 3 cannot communicate directly.

users on the domain at site 2 are pulling incorrect time from the DC at site 2. on the DC at site 2 a w32tm /monitor recognizes a time mismatch between it and the PDC at site 1, but a resync does not fix the issue.

i went ahead and added the PDC at site 1 as a manually added peer, but resyncing still does not fix the issue...

to temporarily fix the issue i did a net time \\DC@site1 /set. i've had to do this twice within the last 3 months. any ideas why the DC at site 2 is not pulling time correctly? i've checked and UDP traffic on port 123 is allowed across our private link, so its not a traffic/routing/networking issue.

many thanks in advance.

ASKER CERTIFIED SOLUTION

Chris

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Chris

to run through the checking you can do some of the following

setup debugging on window time

http://support.microsoft.com/kb/816043

this will create log files and you can tell if its pulling the time from the right place

w32tm /query /status to see what its doing

then
w32tm /monitor /computers:dc2.domain.com,DC01.domain.com (It will show the offset by comparing with your PDC)

or with a nice easy display

w32tm /stripchart /computer:<remote computer>

userPrincipalName

It should be pointed out the Announce Flags on your PDCe should be set to 5. All other DCs should be set to 10.

ChiefIT

Also, how far out of time are they?

MaxAllowedPhaseOffset 300

This means they will not synch unless they are +/- 5 minutes out of synchronization.